Steering lock device

ABSTRACT

A steering lock device includes a trigger that is displaced as a frame cover drops from a frame, an auxiliary lock device that holds a lock member in a locked position as the trigger is displaced under condition that the lock member is positioned in the locked position, a housed component that is arranged in a housing chamber defined by the frame cover and the frame or in a guide hole, and a trigger coupling member that couples the housed component and the trigger. When the housed component is displaced, the trigger is displaced via the trigger coupling member.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of U.S. patent applicationSer. No. 15/360,088, filed Nov. 23, 2016, that is a continuation ofInternational Application No. PCT/JP2015/065075, filed May 26, 2015, andbased upon and claims the benefit of priority from Japanese PatentApplication No. 2014-108752, filed May 27, 2014, the entire contents ofall of which are incorporated herein by reference.

TECHNICAL FIELD

The present application relates to a steering lock device which limitsrotation of a steering shaft of a vehicle.

Background Art

In conventional steering lock devices of this kind, there is known onedisclosed in JP 2009-248843 A. FIG. 17 illustrates a constitution of aconventional electric steering lock device 101. The conventionalelectric steering lock device 101 includes a lock member 150 forprohibiting a steering shaft (not illustrated) from rotating. The lockmember 150 is arranged so as to be movable between a locked positionwhere a tip of the lock member 150 projects from a frame 110 and anunlocked position where the tip is housed in the frame 110.

The conventional electric steering lock device 101 includes an auxiliarylock device 160 including a trigger 171, a trigger urging member 172, anauxiliary lock member 161, an auxiliary lock urging member 162, and anauxiliary lock receiving part 151 f. In the auxiliary lock device 160,when a frame cover 120 is detached from the frame 110, the trigger 171drops off due to an urging force of the trigger urging member 172, sothat the engagement between the trigger 171 and the auxiliary lockmember 161 is released and then, the auxiliary lock member 161 engageswith the auxiliary lock receiving part 151 f of the lock member 150 dueto an urging force of the auxiliary lock urging member 162.

Owing to such an installation of the auxiliary lock device 160, even ifthe frame cover 120 is fraudulently detached under a lock state that thelock member 150 is located in the locked position, the conventionalelectric steering lock device 101 is capable of maintaining its steeringlock state because the lock member 150 is held in the locked position.

SUMMARY

The auxiliary lock device 160 is constructed so as to have a functionalrole when the frame cover 120 is detached from the frame 110. Therefore,if there is performed a fraudulent act of moving the lock member 150 tothe unlocked position by applying an external force to act on the lockmember 150 in some way without detaching the frame cover 120 from theframe 110, the auxiliary lock device 160 does not operate.

In consideration of the above-mentioned situation, an object of thepresent application is to provide a steering lock device which canmaintain a steering lock state against various fraudulent acts.

A steering lock device according to an aspect of the present applicationincludes: a frame provided with at least a cylinder cylindrical part inwhich a cylinder lock is arranged; a frame cover assembled to the frameto close an opening-end side of the cylinder cylindrical part; a lockmember arranged in a guide hole provided in the frame so as to beslidable between a locked position and an unlocked position; a triggerconfigured to be displaced as the frame cover drops from the frame; anauxiliary lock device configured to allow the lock member to be held inthe locked position as the trigger is displaced under a condition thatthe lock member is positioned in the locked position; a housed componentarranged in a housing chamber defined by the frame cover and the frameor in the guide hole; and a trigger coupling member that couples thehoused component and the trigger. When the housed component is displacedagainst the frame cover, the trigger is displaced via the triggercoupling member.

With such a constitution, when the frame cover drops from the frame, theauxiliary lock device is operated, so that the lock member is held inthe locked position, and furthermore, when an external force acts on thehoused component in the housing chamber in some way, the trigger isdisplaced to operate the auxiliary lock device, so that the lock memberis held in the locked position. For this reason, it is possible tomaintain the steering lock state against various fraudulent acts.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is an exploded perspective view illustrating a steering lockdevice according to a first embodiment.

FIG. 2 is a perspective view of the steering lock device according tothe first embodiment, illustrating a situation where a drive unit and alock member are coupled with each other.

FIG. 3 is a perspective view of the steering lock device according tothe first embodiment, illustrating a situation where the drive unit isassembled to a frame.

FIG. 4 is a sectional view of the steering column device according tothe first embodiment, in a normal lock state.

FIG. 5 is a sectional view of the steering column device according tothe first embodiment, illustrating a situation where a frame cover hasbeen detached from the normal lock state.

FIG. 6 is a sectional view of the steering column device according tothe first embodiment, illustrating a situation where a casing part hasdropped off from the normal lock state.

FIG. 7 is a sectional view of the steering column device according tothe first embodiment, illustrating a situation where the drive unit isdisplaced from the normal lock state.

FIG. 8 is a perspective view of a steering lock device according to asecond embodiment, illustrating a trigger in a normal state.

FIG. 9 is a sectional view of the steering lock device according to thesecond embodiment, in the normal lock state.

FIG. 10 is an exploded perspective view illustrating a steering lockdevice according to a third embodiment.

FIG. 11 is a schematic perspective view of the steering lock deviceaccording to the third embodiment, illustrating its internal structure(except an auxiliary lock device) in the normal lock state.

FIG. 12 is a schematic perspective view of the steering lock deviceaccording to the third embodiment, illustrating the internal structure(except the auxiliary lock device) where a key is inserted at locking.

FIG. 13 is a schematic perspective view of the steering lock deviceaccording to the third embodiment, illustrating the internal structure(except the auxiliary lock device) where the lock state has beenreleased with rotation of an inserted key.

FIG. 14 is a schematic perspective view of the steering lock deviceaccording to the third embodiment, illustrating the internal structure(except the auxiliary lock device) where the inserted key isrotationally returned.

FIG. 15 is a lateral-side perspective view of the steering lock deviceaccording to the third embodiment, illustrating a trigger, a triggercoupling member, and an auxiliary lock device in the normal lock state.

FIG. 16 is a front-side perspective view of the steering lock deviceaccording to the third embodiment, illustrating the trigger, the triggercoupling member, and the auxiliary lock device in the normal lock state.

FIG. 17 is an exploded perspective view illustrating a steering lockdevice according to a conventional example.

DESCRIPTION OF EMBODIMENTS First Embodiment

A first embodiment will be described with reference to the drawings. Asteering lock device according to the first embodiment, as an electricsteering lock device 1, is attached to a steering column device (notillustrated) housing an automotive steering shaft (not illustrated) by afixing member (not illustrated). As illustrated in FIGS. 1 to 7, theelectric steering lock device 1 includes a frame 10, a frame cover 20, adrive unit (housed component) 30, a lock member 50, an auxiliary lockdevice 60, and a control substrate (housed component) 35.

As illustrated in FIG. 1, the frame 10 includes a casing part 11 and acylindrical guide part 12 arranged on a bottom face 11 a of the casingpart 11. The guide part 12 has a rectangular cylindrical shapecommunicated with a housing chamber 13 and also provided with itstip-side opened and opposed to the steering shaft. In the guide part 12,the lock member 50 is housed so as to freely reciprocate in a guide hole14 in the form of a cylindrical hole.

The frame cover 20 is formed in a box shape whose one face (i.e. bottomface of FIGS. 1 and 4) opens and also assembled to the frame 10 aslocking receiving parts 21 formed at an internal rim of the opening partof the cover 20 are engaged with locking parts 11 b formed on theperiphery of the casing part 11 of the frame 10. Together with thecasing part 11, the frame cover 20 internally defines the housingchamber 13 as a housing space. Housed in the housing chamber 13 are thedrive unit 30 which applies a driving force for allowing the lock member50 to be displaced and the control substrate 35 which controls theoperation of the drive unit 30.

The drive unit 30 includes an electric motor 31 as a driving source, aworm gear 31 a arranged on an output shaft of the electric motor 31, anda disc-shaped worm wheel 32 formed of a gear engageable with the wormgear 31 a. The worm wheel 32 is provided, on one board face thereof,with a cam 40. The cam 40 includes a spiral cam groove 42 and an outercircumferential face 43. Both an inside sidewall 42 a and the outercircumferential face 43 of the cam groove 42 establish a cam face 41.Then, with a forward rotation of the electric motor 31, the worm gear 31a rotates the worm wheel 32 in the lock releasing direction. With thereverse rotation of the electric motor 31, the worm gear 31 a rotatesthe worm wheel 32 in the lock direction. Under condition that the wormgear 31 a meshes with the worm wheel 32, the drive unit 30 is housed ina motor casing 33 for unitization and then arranged in the housedchamber 13, together with the motor casing 33.

The motor casing 33 includes, on its mating face with the casing part11, an assembling rail 33 a extending along an assembling direction X.By assembling the assembling rail 33 a along the assembling direction X,it is inserted and fitted to a rail groove 11 c formed on the bottomface 11 a of the casing part 11. Note, as illustrated in FIG. 2, theassembling direction X is set to be a direction to insert a followingprojection 52 e of a hanger 52 into the cam groove 42 of the worm wheel32 (i.e. depth direction of the cam groove 42).

As illustrated in FIGS. 1 and 2, the lock member 50 includes a lock body51 whose front end (advance-side end) engages with an engagement groove(not illustrated) formed on the outer circumferential face of thesteering shaft, the hanger 52 disengageably coupled with the rear end(retreat-side end) of the lock body 51, and a lock urging member 53 forurging the lock body 51 from the retreat-end side to the advance-endside. While the lock body 51 is being coupled with the hanger 52, thelock body 51 and the hanger 52 are arranged so as to freely reciprocatein the guide hole 14 of the guide part 12. That is, a coupling portion50 a between the lock body 51 and the hanger 52 is composed of abody-side coupling part 51 b provided at the rear end of the lock body51 and a hanger-side coupling part 52 b provided at the front end of thehanger 52. Consequently, the lock member 50 is slidably displacedbetween a locked position as the advance end and an unlocked position asthe retreat end by the drive unit 30. At the locked position, the frontend of the lock body 51 projects from the guide part 12 and engages withengagement groove to limit the rotation of the steering shaft. Also, atthe unlocked position, the front end of the lock body 51 retreats intothe guide part 12 and departs from the engagement groove to allow therotation of the steering shaft.

The lock body 51 is made from a plate-like hard member. The front end ofthe lock body 51 is set to an engagement part 51 a for engagement withthe engagement groove. The rear end of the lock body 51 is set to thebody-side coupling part 51 b to be coupled with the hanger 52. Thebody-side coupling part 51 b is L-shaped by a body-side neck part 51 cextending in the sliding direction and a body-side coupling projectingpart 51 d projecting from the rear end of the body-side neck part 51 cperpendicularly to the sliding direction.

The hanger 52 is made from a member having a withstand load smaller thanthat of the lock body 51. The hanger 52 includes the hanger-sidecoupling part 52 b and a following projection 52 e.

The hanger-side coupling part 52 b is arranged at the front end of thehanger 52 and also formed of an L-shaped projection composed of ahanger-side neck part 52 c and a hanger-side coupling projecting part 52d.

The hanger-side neck part 52 c is formed thinner than any other generalparts of the hanger 52 and also formed so as to extend in the slidingdirection of the lock member 50.

The hanger-side coupling projecting part 52 d is formed so as to projectfrom the front end of the hanger-side neck part 52 c perpendicularly tothe sliding direction.

The following projection 52 e is positioned at the rear end of thehanger 52 and formed so as to project toward the worm wheel 32. Undercondition that the lock member 50 is assembled in the guide hole 14 andthe worm wheel 32 is installed in the housing chamber 13, the followingprojection 52 e is arranged in the cam groove 42. Then, when the wormwheel 32 rotates forward or reversely, the following projection 52 ereceives an urging force of the lock urging member 53 and follows thecam face 41 while abutting on it.

The lock urging member 53, which is formed by a coil spring, iscompressively disposed between a retreat end wall (not illustrated) ofthe guide hole 14 and a retreat end 51 e on the back-face side of thebody-side coupling part 51 b. Then, the hanger 52 and the lock body 51are kelp in their coupled state while they are being urged in mutuallyseparating directions by a compressive reaction force of the lock urgingmember 53. Additionally, owing to such a coupling structure, the lockmember 50 is adapted so as to be expandable and contractable.

The auxiliary lock device 60 includes an auxiliary lock member 61arranged to be movable between an engaged position and a disengagedposition, an auxiliary lock urging member 62 formed by a coil spring tourge the auxiliary lock member 61 from the disengaged position towardthe engaged position, and the trigger 70 which holds the auxiliary lockmember 61 in the disengaged position. The auxiliary lock member 61 andthe auxiliary lock urging member 62 are housed in an auxiliary lockhousing part 15 formed in the guide part 12 to communicate with theguide hole 14 under condition that the auxiliary lock urging member 62is urged.

The auxiliary lock member 61 positioned in the engaged position engageswith an auxiliary lock receiving groove 51 f formed in the lock body 51positioned in the locked position to limit the movement of the lockmember 50 to the unlocked position. The auxiliary lock member 61positioned in the disengaged position departs from the lock body 51 toallow the movement of the lock member 50 between the locked position andthe unlocked position.

As illustrated in FIGS. 1 and 4 to 7, the trigger 70 includes a flattrigger body 71 molded in crank form and a trigger urging member 72formed by a coil spring. In the normal state of the trigger 70, thetrigger urging member 72 is compressively pinched between an L-shapedstep part 71 a formed in the middle of the trigger body 71 and thebottom face 11 a of the housing chamber 13 and additionally, the tipside of the trigger body 71 is inserted removably into a trigger hole 16communicating the housing chamber 13 with the auxiliary lock housingpart 15, while the rear end of the trigger body 71 is housed in abutmentwith the inner face of the frame cover 20 by a compressive reactionforce of the trigger urging member 72. The tip part projecting into theauxiliary lock housing part 15 engages with the auxiliary lock member 61to hold it in the disengaged position. The tip side of the trigger body71 is coupled with the trigger coupling member 73.

The trigger hole 16, in which the trigger body 71 is located, is formedin a generally V-shape with respect to the assembling direction X sothat its width dimension gets narrower on the side of the auxiliary lockhousing part 15 (i.e. side of the auxiliary lock device 60) and broaderon the side of the housing chamber 13 and also established so that thedepth dimension of the hole 16 gets somewhat larger than the thicknessdimension of the trigger body 71. Consequently, the trigger body 71 isadapted so as to be swingable in the assembling direction X (left andright directions of FIGS. 4 to 7).

The trigger coupling member 73 includes a plate-like member projectingfrom the outer circumferential face of the motor casing 33 along anopening edge of the trigger hole 16 on the side of the housing chamber13. The trigger coupling member 73 includes a trigger coupling part 73 ain the form of a rectangular frame. The trigger coupling part 73 a hasits rectangular frame into which the tip side of the trigger body 71 isinserted.

The control substrate 35 supplies the electric motor 51 with externalelectric power and executes the controls of forward rotation, reverserotation and rotation stop of the electric motor 51.

Next, the operation of the electric steering lock device 1 according tothe first embodiment will be described. First, as illustrated in FIG. 4,the lock body 51 projects from the guide part 12 in the electricsteering lock device 1 where the lock member 50 is held in the lockedposition. Thus, the engagement part 51 a of the lock body 51 engageswith the engagement groove of the steering shaft to limit the rotationof the steering shaft.

Then, when an unlock signal is inputted from a vehicle-body side to theelectric steering lock device 1 under the lock state, the controlsubstrate 35 supplies electric power so that the electric motor 31rotates forward. With the forward rotation of the electric motor 31, theworm wheel 32 rotates in the unlocking direction through the worm gear31 a. When the worm wheel 32 rotates in the unlocking direction, thefollowing projection 52 e follows over the cam face 41 whilewithstanding the urging force of the lock urging member 53.Consequently, the lock member 50 moves from the locked position to theunlocked position.

Then, when the lock member 50 is displaced to the unlocked position, theelectric power supplied from the control substrate 35 to the electricmotor 31 is cut off, so that the electric motor 31 is stopped. Thus, thelock member 50 is held in the unlocked position.

In the electric steering lock device 1 under the unlock state, the lockbody 51 is positioned in the unlocked position where it is withdrawninto the guide hole 14. Thus, the engagement between the engagement part51 a of the lock body 51 and the engagement groove of the steering shaftis released to allow the rotation of the steering shaft.

Next, a lock signal is inputted from the vehicle body side to theelectric steering lock device 1 under the unlock state through thecontrol substrate 35, it supplies the electric power so that theelectric motor 31 rotates reversely. Then, with the reverse rotation ofthe electric motor 31, the worm wheel 32 is rotated in the lockingdirection through the worm gear 31 a. When the worm wheel 32 rotates inthe locking direction, the following projection 52 e follows over thecam face 41 by the urging force of the lock urging member 53, so thatthe lock member 50 moves from the unlocked position to the lockedposition.

Then, when the lock member 50 is displaced to the locked position, theelectric power supplied from the control substrate 35 to the electricmotor 31 is cut off, so that the electric motor 31 is stopped. Thus, thelock member 50 is held in the locked position. In the electric steeringlock device 1 where the lock member 50 is held in the locked position,the engagement part 51 a of the lock body 51 engages with the engagementgroove of the steering shaft to limit the rotation of the steeringshaft.

In connection, if the engagement part 51 a of the lock body 51 runs on aprojection part (not illustrated) constituting the engagement groove ofthe steering shaft in process of moving to the locked position, the lockurging member 53 is compressed for shrinkage and the hanger 52 moves tothe locked position under condition that the lock body 51 b is remainedto run on the projection part. Then, when the steering shaft is rotatedso that the projection part deviates from the engagement part 51 a ofthe lock body 51, the urging force of the lock urging member 53 allowsthe engagement part 51 a to be engaged with the engagement groove tolimit the rotation of the steering shaft.

Next, if an external force is applied to the steering lock device 1 by afraudulent act or the like to cause the frame cover 20 to be dropped offfrom the frame 10, as illustrated in FIG. 5, the trigger body 71 departsfrom the trigger hole 16 due to the compressive reaction force of thetrigger urging member 72, so that the engagement between the triggerbody 71 and the auxiliary lock member 61 is released and furthermore,the auxiliary lock member 61 is moved toward the engaged position by theurging force of the auxiliary lock urging member 62. At this time, ifthe lock member 50 is positioned at the locked position, the auxiliarylock member 61 engages with the auxiliary lock receiving groove 51 f ofthe lock body 51, so that the lock member 50 is held in the lockedposition.

Alternatively, if an external force is applied to the steering lockdevice 1 by a fraudulent act or the like to cause the casing part 11 tobe separated from the guide part 12 (i.e. breakage of the frame 10), asillustrated in FIG. 6, the trigger body 71 is displaced to release theengagement between the trigger body 71 and the auxiliary lock member 61,so that the auxiliary lock member 61 is moved toward the engagedposition by the urging force of the auxiliary lock urging member 62. Atthis time, if the lock member 50 is positioned at the locked position,the auxiliary lock member 61 engages with the auxiliary lock receivinggroove 51 f of the lock body 51, so that the lock member 50 is held inthe locked position.

Additionally, if an external force intended to cancel the couplingbetween the can groove 42 and the following projection 52 e whileleaving the frame cover 20 where it is, namely, an external force in theopposite direction of the assembling direction X is applied on the motorcasing 33 by a fraudulent act, the motor casing 33 is displaced alongthe rail groove 11 c, as illustrated in FIG. 7. Consequently, thetrigger coupling member 73 is also displaced together with the motorcasing 33 to abut on the trigger body 71, causing falling down of thetrigger body 71. Then, with the trigger body 71 falling down, theengagement between the trigger body 71 and the auxiliary lock member 61is cancelled, so that the urging force of the auxiliary lock urgingmember 62 causes the auxiliary lock member 61 to be moved toward theengaged position. At this time, if the lock member 50 is positioned inthe locked position, the auxiliary lock member 61 engages with theauxiliary lock receiving groove 51 f of the lock body 51, so that thelock member 50 is held in the locked position. In connection, thetrigger coupling part 73 a is set in a portion of the trigger body 71closer to its tip and therefore, when an external force is applied onthe motor casing 33, it is possible to allow the trigger 70 to bedisplaced by a little displacement of the motor casing 33, therebyallowing the auxiliary lock device 60 to be operated.

With the above-mentioned constitution, for the fraudulent act intendedto detach the frame cover 20 from the frame 10 and the fraudulent actintended to break the frame 10, it is possible to hold the lock member50 in the locked position owing to the operation of the auxiliary lockdevice 60.

With respect to the constitution of the first embodiment, additionally,there is supposed a fraudulent act of allowing the drive unit 30 forlimiting the movement of the lock member 50 to move without removing theframe cover 20 to cancel the coupling with the following projection 52e, thereby allowing the movement of then lock member 50 from the lockedposition to the unlocked position. Also for such a fraudulent act, asthe auxiliary lock device 60 operates when the motor casing 33constituting the drive unit 30 is about to be moved, it is possible tohold the lock member 50 in the locked position.

With the trigger coupling part 73 a in the form of a frame through whichthe trigger 70 penetrates, even if the trigger coupling member 73 isdisplaced to any direction, the trigger coupling part 73 a would abut onthe trigger 70 for its deformation. Thus, it is possible to operate theauxiliary lock device 60 reliably.

With the trigger coupling member 73 arranged in the driving unit 30,even if the driving unit 30 is displaced by a fraudulent act from theoutside so that the coupling between the driving unit 30 and the lockmember 50 is cancelled to release a movement restraint of the lockmember 50, the lock member 50 can be held in the locked position as theauxiliary lock device 60 is operated.

Even when a fraudulent act intended to release the coupling between thedriving unit 30 and the lock member 50 is performed from the outside, itis possible to operate the auxiliary lock device 60 more reliably as thedriving unit 30 is displaced in a direction to release its coupling withthe lock member 50 without being displaced in an unprepared direction.

Since the trigger hole 16, in which the trigger body 71 is located, isformed in a generally V-shape so that a trigger hole's width dimensionalong the assembling direction X gets narrower on the side of theauxiliary lock housing part 15 and broader on the side of the housingchamber 13, the trigger body 71 is adapted so as to be swingable in theassembling direction X. Consequently, when a fraudulent act intended torelease the coupling between the driving unit 30 and the lock member 50is performed from the outside, the trigger body 71 is easy to fall down,allowing the auxiliary lock member 61 to be operated by slightdisplacement of the trigger body 71 reliably.

Second Embodiment

Next, a second embodiment will be described with reference to thedrawings. As illustrated in FIGS. 8 and 9, an electric steering lockdevice 1A according to the second embodiment differs from that of thefirst embodiment in the constitution of a trigger coupling member 73A.The other constitutions are basically similar to those of the firstembodiment. Note, in the second embodiment, elements similar to those ofthe first embodiment are indicated with the same reference numerals andtheir descriptions are omitted.

A trigger coupling member 73A according to the second embodiment isarranged on the control substrate 35. The constitution where the triggercoupling member 73A has a trigger coupling part 73 aA in the form of arectangular frame through which the trigger body 71 is inserted issimilar to that of the first embodiment.

In the constitution mentioned above, if the electric steering lockdevice 1A is subjected to an excessive force coming from an action ofe.g. hitting the same device of FIG. 9 from the right side with use of atool, the control substrate 35 bends to the left of the figure, so thatthe trigger coupling part 73 aA is displaced. This will allow thetrigger coupling part 73 aA to abut on the trigger body 71, therebycausing the trigger body 71 falling-down. Then, with the trigger body 71falling down, the engagement between the trigger body 71 and theauxiliary lock member 61 is released and successively, the auxiliarylock member 61 is moved toward the engaged position by the urging forceof the auxiliary lock urging member 61.

Also in the second embodiment, a similar effect to the first embodimentcan be obtained.

Third Embodiment

A third embodiment will be described with reference to the drawings.While the first embodiment is directed to the electric steering lockdevice, the third embodiment is directed to a mechanical steering lockdevice.

As illustrated in FIGS. 10 to 16, a steering lock device 1B according tothe third embodiment includes a frame 10B, a frame cover 20B, a cylinderlock 3, an ignition switch 5, a lock member 50B, an auxiliary lockdevice 60B, and a check mechanism 80.

The frame 10B is formed into a Y shape by three cylindrical parts, thatis, a cylinder cylindrical part 17 a, a lock cylindrical part 17 b, anda switch cylindrical part 17 c. For reducing weight of the whole device,in the third embodiment, the cylinder cylindrical part 17 a and theswitch cylindrical part 17 c are molded into one body by resinousmaterial, while the lock cylindrical part 17 b is made from metallicmaterial. In the third embodiment, a cylindrical hole of the lockcylindrical part 17 b constitutes a guide hole 14B.

The cylinder lock 3 and the check mechanism 80 are arranged in thecylinder cylindrical part 17 a. The lock member 50B and the auxiliarylock device 60B are arranged in the lock cylindrical part 17 b. Theignition switch 5 is arranged in the switch cylindrical part 17 c. Acoupling member 36 is arranged inside a part where three cylindricalpart 17 a, 17 b and 17 c are connected with each other. The cylinderlock 3, the lock member 50B, and the ignition switch 5 are coupled witheach other by the coupling member 36.

The cylinder lock 3 is provided, on one end side thereof, with a keyhole 3 a as an inserting part into which a key 7 to be carried andoperated by a passenger is inserted. The cylinder lock 3 is provided, onthe other end side, with a connecting part 3 b. The cylinder lock 3 isarranged in the cylinder cylindrical part 17 a so that when the cylinderlock 3 is housed in a sleeve 3 c having a substantially cylindricalshape, the key hole 3 a is position at an end of the cylindercylindrical part 17 a on its opening-end side. The cylinder lock 3 isconstructed so that only if the key 7 inserted into the key hole 3 a isa regular key, the cylinder lock 3 is unlocked to make the key 7rotatable in the sleeve 3 c around its axis, together with theconnecting part 3 b. At the connecting part 3 b of the cylinder lock 3,there is located the coupling member 36 that moves together with theconnecting part 3 b.

The frame cover 20B is assembled to the opening end of the cylindercylindrical part 17 a to define a housing chamber 13B as a housingspace, together with the cylinder cylindrical part 17 a. The cylinderlock 3 is arranged in the housing chamber 13B so as to allow a rotationof the key 7 inserted into the key hole 3 a.

The coupling member 36 is formed by a thick plate having a disc shapeand also connected, on one face side, with the connecting part 3 b torotate integrally with the cylinder lock 3, about its axis. The couplingmember 36 is formed, on its circumferential-side portion on one faceside, with a cam part 40B. The coupling member 36 is also formed, on theother face side, with a bevel gear part 37.

The cam part 40B is formed with a cam face 41B which changes its axialdimension in accordance with its rotation.

The bevel gear part 37 is coupled with the ignition switch 5 by meshingwith a gear part 5 a of the ignition switch 5. By rotationally operatingthe regular key 7, the coupling member 36 and the gear part 5 a rotatetogether, so that the position set in the ignition switch 5 is switchedover.

Similarly to the first embodiment, the lock member 50B includes a lockbody 51B, a hanger 52B, and a lock urging member 53B, and is freelydisplaced between the locked position as the advance end and theunlocked position as the retreat end.

The lock body 51B is made from a plate-like hard member, as similar tothe first embodiment. The front end of the lock body 51B is set to theengagement part 51 a for engagement with the engagement groove. The rearend of the lock body 51B is set to the body-side coupling part 51 b tobe coupled with the hanger 52B. The body-side coupling part 51 b has ahook shape projecting obliquely to the sliding direction.

The hanger 52B is made from a member having a withstand load smallerthan that of the lock body 51B. The hanger 52 includes the hanger-sidecoupling part 52 b, the following projection 52 e, and anengagement/disengagement opening 52 f. In the third embodiment, thehanger 52B functions as the housed component.

The hanger-side coupling part 52 b is arranged at the front end of thehanger 52B and also shaped in the form of a rectangular frame into whichthe body-side coupling part 51 b is inserted removably.

The following projection 52 e is positioned at the rear end of thehanger 52 and formed so as to project toward the coupling member 36.When the coupling member 36 is rotated by the unlocking operation, thefollowing projection 52 e receives an urging force of the lock urgingmember 53 and follows the cam face 41 while abutting on it.

The engagement/disengagement opening 52 f is an opening which is formedat the opposite end of the hanger-side coupling part 52 b and alsoshaped in the form of a rectangular frame. The engagement/disengagementopening 52 f is configured so as to be engageable/disengageable with aholding hook 81 c of a check rod 81 constituting the check mechanism 80.

The hanger 52B is slidably arranged in a groove-like hanger housing part(not illustrated) provided on the inner face of the lock cylindricalpart 17 b along the longitudinal direction of the lock cylindrical part17 b. In the hanger housing part outside the hanger 52B, a lock cover 74as the trigger coupling member is arranged so as to surround the hanger52B on three sides.

The lock urging member 53B, which is formed by a coil spring, iscompressively disposed between a retreat end wall 14 a of the guide hole14 and the retreat end 51 e on the back-face side of the body-sidecoupling part 51 b. By a compressive reaction force of the lock urgingmember 53B, the hanger 52B and the lock body 51B are held in theircoupled state while they are being urged in mutually separatingdirections. Additionally, owing to such a coupling structure, the lockmember 50B is adapted so as to be expandable and contractable. As thelock body 51B is urged and held from the side of the unlocked positiontoward the side of the locked position by the lock urging member 53B,when the coupling member 36 rotates in the forward rotating direction,the following projection 52 e moves along the slanted face of the camface 41B, so that the hanger 52B and the lock body 51B slide from thelocked position to the unlocked position.

Similarly to the first embodiment, the auxiliary lock device 60Bincludes an auxiliary lock member 61B, an auxiliary lock urging member62B and a trigger 70B. The trigger 70B comprises a trigger body 71B, anda trigger urging member 72B.

The trigger body 71B is formed by a shaft member obtained by moldingresinous material into a rod shape. The trigger body 71B is formed, atan intermediate portion, with a bulb-shaped swelling part 71 b.

The trigger urging member 72B is formed by a coil spring. In the normalstate, under a condition that a shaft portion of the trigger body 71B atthe tip side from the swelling part 71 b is inserted into the cylinder,the trigger urging member 72B is compressively pinched between a steppart (not illustrated) in the trigger hole 16B and the swelling part 71b. In such a condition, the trigger body 71B is housed so that the rearend of the trigger body 71B abuts on the inner face of the frame cover20B by a compressive reaction force of the trigger urging member 72Bwhile the tip side of the trigger body 71B is being inserted removablyinto the trigger hole 16. Then, the tip part of the trigger bodyprojecting into the auxiliary lock housing part 15B engages with theauxiliary lock member 61B to hold it in the disengaged position.

A trigger coupling member 73B is provided in a lock cover 74 having aplate-like metallic material having an U shape and includes a triggercoupling part 73 b shaped of an annular frame. In the trigger body 71B,its portion on the rear-end side from the swelling part 71 b is insertedinto the annular frame of the trigger coupling part 73 b.

The check mechanism 80 includes a check rod 81, a check urging member82, and a check piece 83, and also detects whether or not the key 7 hasbeen inserted into the hey hole 3 a.

Like a weighing machine, the check rod 81 has an intermediate fulcrum 81a allowing both ends of the rod to be swingable, and is disposed on oneside of the cylinder lock 3 along the axial direction of the cylinderlock 3. The check rod 81 includes, on the side of the key hole 3 a, ahook-like check projection 81 b projecting toward the cylinder lock 3and, on the side of the connecting part 3 b, a holding hook 81 cprojecting into a hook so as to be engageable/disengageable with theengagement/disengagement opening 52 f. the check urging member 82 isdisposed between the intermediate fulcrum 81 a and the check projection81 b, so that the urging force of the check urging member 81 acts on thecheck rod 81 from the outside of the cylinder lock 3 toward the inside.Consequently, in the check rod 81, the check projection 81 b and theholding hook 81 c are swingably supported by the intermediate fulcrum 81a as a swinging fulcrum, and furthermore, the holding hook 81 c isswingably supported by the check projection 81 b as a fulcrum.

On a lateral part of the cylinder lock 3 on which the check projection81 b abuts due to the urging force of the check urging member 82, apiece hole 84 is opened to penetrate the cylinder lock 3 from itscircumferential face into the key hole 3 a. The check piece 83 isarranged movably in the piece hole 84.

In the standby state, the check piece 83 projects into the key hole 3 aon receipt of the urging force of the check urging member 82. When thekey 7 is inserted into the key hole 3 a, the check piece 83 is pushedout of the key hole 3 a by the tip of the key 7 inserted into the keyhole 3 a, against the urging force of the check urging member 82. Thecheck piece 83 is set in its shape and dimension so that an outer endface 83 a of the check piece 83 aligns with the outer circumferentialface of the cylinder lock 3 under condition that the check piece 83 ispushed out of the key hole 3 a. When the key 7 is pulled out of the keyhole 3 a, the check piece 83 moves to the interior of the cylinder lock3 and projects into the key hole 4, on receipt of the urging force ofthe check urging member 82.

Next, in the above-mentioned constitution, the operation of the steeringlock device 1B will be described.

In the steering lock device 1B in the standby state in locking, asillustrated in FIG. 11, the lock body MB is positioned in the lockedposition while being urged from the side of the unlocked position to theside of the locked position by the lock urging member 53B. The hanger52B is positioned in the locked position while the following projection52 e is being urged onto the cam face 41B through the coupled lock body51B by the urging force of the lock urging member 53B. The cylinder lock3 is locked while the key 7 is being located in such a state as can beinserted or removed, and additionally, the check piece 83 projects intothe key hole 3 a by the urging force of the check urging member 82.

When inserting the key 7 into the key hole 3 a, as illustrated in FIG.12, the check piece 83 is pushed out of the key hole 3 a and the checkrod 81 swings with the intermediate fulcrum 81 a as a fulcrum (rotatesin the counterclockwise direction of FIG. 12). Additionally, if theinserted key 7 is the regular key 7, then the cylinder lock 3 isunlocked to be rotatable in the normal rotation direction.

With the regular key 7 rotated in the normal rotation direction, asillustrated in FIG. 13, the check projection 81 b abutting on the outerend face 83 a of the check piece 83 moves on the outer circumferentialface 3 e of the cylinder lock 3. Additionally, with the rotation of thecylinder lock 3, the coupling member 36 is also rotated. Then,corresponding to the rotation of the coupling member 36, the followingprojection 52 e follows on the cam face 41B, so that the hanger 52B isdisplaced from the locked position to the unlocked position. Here, whenthe hanger 52B is displaced to the unlocked position, the holding hook81 c of the check rod 81 swings with the check projection 81 b andclimbs over the rectangular frame of the engagement/disengagementopening 52 f of the hanger 52B to engage with theengagement/disengagement opening 52 f. With this engagement of theengagement/disengagement opening 52 f with the holding hook 81 c, thehanger 52B is held in the unlocked position. Then, with thisdisplacement of the hanger 52B to the unlocked position, the lock bodyMB coupled with the hanger 52B is displaced to the unlocked positionwhile compressing the lock urging member 53B.

With the key 7 rotated in the reverse rotation direction, when thecylinder lock 3 is rotated up to the same position as the stand-bystate, it becomes possible to extract the key 7, as illustrated in FIG.14. By rotating the key 7 in the reverse rotation direction,additionally, the check projection 81 b returns to a path that itfollowed at the normal rotation the route and abuts on the outer endface 83 a of the check piece 83. During this process, as the check rod81 does not swing to maintain the engagement between the holding hook 81c and the engagement/disengagement opening 52 f, the followingprojection 52 e departs from the cam face 41B and the hanger 52B is heldin the unlocked position.

When extracting the key 7 from the cylinder lock 3 positioned in thesame position as the standby state, the check piece 83 is displaced intothe key hole 3 a by the urging force of the check urging member 82.Consequently, the check rod 81 swings with the intermediate fulcrum 81 aas a fulcrum (i.e. rotation in the clockwise direction of FIG. 14), sothat the engagement between the holding hook 81 c and theengagement/disengagement opening 52 f is released. Then, with theengagement between the holding hook 81 c and theengagement/disengagement opening 52 f released, the lock body 51B andthe hanger 52B are displaced to the locked position and thus broughtinto the condition illustrated in FIG. 11.

Next, if an external force by a fraudulent act or the like is applied tothe steering lock device 1B thereby causing the frame cover 20B to dropfrom the frame 10B or causing the frame 10B to be broken, the triggerbody 71B drops by the urging force of the trigger urging member 72B, andadditionally, the auxiliary lock member 61 is displaced toward theengaged position by the auxiliary lock urging member 62, as similar tothe first embodiment.

Alternatively, if an excessive external force is applied by a fraudulentact, for example, striking the side face of the cylinder cylindricalpart 17 a by a tool, then the cylinder cylindrical part 17 a isdeflected or broken to cause the lock cover 74 to be displaced. With thelock cover 74 displaced, the trigger coupling part 73 b abuts on thetrigger body 71B to cause its breakage, so that the trigger body 71B isdisplaced by the urging force of the trigger urging member 72B. Then,with the trigger body 71B displaced, the engagement between the triggerbody 71 and the auxiliary lock member 61 is released, so that theauxiliary lock member 61 moves toward the engaged position due to theurging force of the auxiliary lock urging member 62.

Also in the third embodiment, a similar effect to the first embodimentis obtained, and additionally, with the trigger coupling member 73arranged in the lock cover 74 surrounding the lock member 50Badjacently, when an external force derived from a fraudulent act fromthe outside acts on the lock member 50B, the lock cover 74 is displacedto cause the trigger body 71 to be broken and displaced, so that theauxiliary lock device 60 is operated to allow the lock member 50B to beheld in the locked position.

What is claimed is:
 1. A steering lock device, comprising: a frameprovided with at least a cylinder cylindrical part in which a keycylinder lock is arranged, with the key cylinder lock housed in a sleevehaving a substantially cylindrical shape, the key cylinder lockconstructed so that the key cylinder lock unlocks to make a keyrotatable in the sleeve around an axis of the sleeve; a frame coverassembled to the frame to close an opening-end side of the cylindercylindrical part; a lock member arranged in a guide hole provided in theframe so as to be slidable between a locked position and an unlockedposition; a trigger configured to be displaced as the frame cover dropsfrom the frame; an auxiliary lock device configured to allow the lockmember to be held in the locked position as the trigger is displacedunder a condition that the lock member is positioned in the lockedposition; a housed component arranged in a housing chamber defined bythe frame cover and the frame or in the guide hole; and a triggercoupling member that couples the housed component and the trigger,wherein when the housed component is displaced against the frame cover,the trigger is displaced via the trigger coupling member.
 2. Thesteering lock device of claim 1, wherein the trigger coupling memberincludes a trigger coupling part having a frame-like shape through whichthe trigger penetrates, and with the housed component displaced againstthe frame cover by an external force, the trigger coupling part abuts onthe trigger, thereby causing the trigger to be displaced.
 3. Thesteering lock device of claim 1, wherein the housed component is a lockcover arranged so as to surround the lock member adjacently.
 4. Thesteering lock device of claim 1, wherein the frame is formed into a Yshape by the cylinder cylindrical part, a switch cylindrical part inwhich an ignition switch is arranged, and a lock cylindrical part inwhich the lock member and the auxiliary lock device are arranged.
 5. Thesteering lock device of claim 4, wherein a coupling member is arrangedinside a part where the cylinder cylindrical part, the lock cylindricalpart, and the switch cylindrical part are connected with each other, andthe key cylinder lock, the lock member, and the ignition switch arecoupled with each other by the coupling member.
 6. The steering lockdevice of claim 1, wherein a connecting part, with the sleeve rotatingabout its axis together with the connecting part; and a coupling memberthat moves together with the connecting part, wherein a predeterminedexcessive force applied to the lock causes the cylinder cylindrical partto deflect or break to cause displacement of the lock cover so that theauxiliary lock member moves toward the locked position.
 7. A steeringlock device, comprising: a frame provided with at least a cylindercylindrical part in which a key cylinder lock is arranged; a connectingpart, with the sleeve rotating about its axis together with theconnecting part; a coupling member that moves together with theconnecting part, wherein a predetermined excessive force applied to thelock causes the cylindrical part to deflect or break to causedisplacement of the lock cover so that the auxiliary lock member movestoward the locked position; a frame cover assembled to the frame toclose an opening-end side of the cylinder cylindrical part; a lockmember arranged in a guide hole provided in the frame so as to beslidable between a locked position and an unlocked position; a triggerconfigured to be displaced as the frame cover drops from the frame; anauxiliary lock device configured to allow the lock member to be held inthe locked position as the trigger is displaced under a condition thatthe lock member is positioned in the locked position; a housed componentarranged in a housing chamber defined by the frame cover and the frameor in the guide hole; and a trigger coupling member that couples thehoused component and the trigger, wherein when the housed component isdisplaced against the frame cover, the trigger is displaced via thetrigger coupling member.